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• W2058348700 abstract "The future sustainability of aquaculture will depend in part on the reduction of fishmeal (FM)used in fish feeds and the development of economically alternative protein sources. Poultry meal(PM) is one example of an alternative protein source. The aim of this study was to understand theeffects of FM replacement with PM on nutrition, physiology and performance of rainbow trout.Four independent experiments using isoenergetic and isonitrogenous feeds (22 MJ GE kg-1 DM,400 g kg-1 DM of crude protein) were carried out. An initial study investigated the effect ofreplacing FM protein with increasing amounts of PM protein in which 0, 20, 30 and 40% FMprotein was replaced with PM protein. Fish were grown in freshwater at 15°C for 84 days, duringwhich time they were fed twice daily at 2% bw d-1.The results indicated that PM protein can beused to replace up to 40% of the FM protein without impaired fish growth, apparent digestibilityof crude protein, insulin like growth factor I (IGF I) and cortisol. A further study was carried outto determine the effects of replacement on apparent digestibility where twelve isoenergetic andisonitrogenous feeds were formulated in which 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 95 and 100%FM protein was replaced with PM protein. Fish were grown in freshwater at 15°C for 27 days,during which time they were fed twice daily until satiation. Faeces were stripped from fish onday 3, 9 and day 27. Effects of poultry meal inclusion level on apparent digestibility showed thesignificant negative linear relationships between PM inclusion and apparent digestibilitymeasured as AD crude protein, AD total lipid and AD gross energy. There were no significantdifferences in AD crude protein or AD total lipid between the three adaptation times. However,AD gross energy increased over time. A further experiment evaluated the effects of temperatureon FM with increasing PM at two different temperatures (15oC and 20oC). Twelve isoenergeticand isonitrogenous feeds were formulated in which 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 95 and 100% FM protein was replaced with PM protein. Fish were fed twice daily at 2% bw d-1 for aperiod of 112 days. Results indicate the high potential of PM as an alternative protein source atoptimal and high temperatures. In addition, result on histology of the distal intestine showed thatincrease in the number of goblet cells (GC) and decrease in the width of supranuclear vacuoles(SNV) in fish fed diets containing greater than 90% of PM protein at both temperatures. The lastexperiment was designed to test the effects of supplementary essential amino acids (L-lysine andL-histidine) on rainbow trout. Fish was fed either a set daily ration of 1.7% bw·d-1 or fed tosatiation. The results indicated that supplementary essential amino acids (EAA), L-lysine and Lhistidinein PM diet did not improve growth of rainbow trout." @default.
• W2058348700 created "2016-06-24" @default.
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• W2058348700 date "2013-05-01" @default.
• W2058348700 modified "2023-09-27" @default.
• W2058348700 title "Impact of fish meal replacement with poultry meal on rainbow trout ( Oncorhynchus mykiss ) nutrition, physiology and performance" @default.
• W2058348700 hasPublicationYear "2013" @default.
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